On Nov 20, 2014, at 5:51 PM, Kyle Briton Lawlor <klawlor...@gmail.com> wrote:
> I am now trying to work with Neumann boundary conditions with this diffusion > problem. > I have come across the following implementation of Neumann BC’s: > var.faceGrad.constrain(2 * mesh.faceNormals, where=mesh.exteriorFaces) > However, I am using Gmsh2D() which “ has no attribute ‘faceNormals’ “. > Is there an equivalent sort of a function for Gmsh2D()? What version of FiPy are you running? python -c "import fipy; print fipy.__version__" I would guess 3.0.something. The documentation on our website is for FiPy 3.1, where mesh.faceNormals was introduced. Prior to that, it was mesh._faceNormals. > Also, with the above line of code, instead of a value of 2, could I specify > something like sin(var). That is can I specify the boundary condition to > involve the solution variable at the boundary? > var.faceGrad.constrain(sin(var) * mesh.faceNormals, where=mesh.exteriorFaces) var will need to be a FaceVariable, but yes, you should be able to do this. _______________________________________________ fipy mailing list fipy@nist.gov http://www.ctcms.nist.gov/fipy [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ]
